springboot 自定义异常及使用

https://baijiahao.baidu.com/s?id=1613899474131869768&wfr=spider&for=pc

在Spring 3.2中，

新增了@ControllerAdvice、@RestControllerAdvice 注解，

用于定义@ExceptionHandler、@InitBinder、@ModelAttribute，

并应用于@RequestMapping、@PostMapping， @GetMapping注解中。

1.自定义异常

/**
 * 异常处理器
 */
@RestControllerAdvice
public class BDExceptionHandler {
    private Logger logger = LoggerFactory.getLogger(getClass());
    @Autowired
    LogService logService;


    @ExceptionHandler(AuthorizationException.class)
    public Object handleAuthorizationException(AuthorizationException e, HttpServletRequest request) {
        logger.error(e.getMessage(), e);
        if (HttpServletUtils.jsAjax(request)) {
            return R.error(403, "未授权");
        }
        return new ModelAndView("error/403");
    }


    @ExceptionHandler({Exception.class})
    public Object handleException(Exception e, HttpServletRequest request) {
        LogDO logDO = new LogDO();
        logDO.setGmtCreate(new Date());
        logDO.setOperation(Constant.LOG_ERROR);
        logDO.setMethod(request.getRequestURL().toString());
        logDO.setParams(e.toString());
        UserDO current = ShiroUtils.getUser();
        if(null!=current){
            logDO.setUserId(current.getUserId());
            logDO.setUsername(current.getUsername());
        }
        logService.save(logDO);
        logger.error(e.getMessage(), e);
        if (HttpServletUtils.jsAjax(request)) {
            return R.error(500, "服务器错误，请联系管理员");
        }
        return new ModelAndView("error/500");
    }
}

2.异常处理器

/**
 * 异常处理器
 */
@RestControllerAdvice
public class BDExceptionHandler {
    private Logger logger = LoggerFactory.getLogger(getClass());
    @Autowired
    LogService logService;

    @ExceptionHandler(AuthorizationException.class)
    public Object handleAuthorizationException(AuthorizationException e, HttpServletRequest request) {
        logger.error(e.getMessage(), e);
        if (HttpServletUtils.jsAjax(request)) {
            return R.error(403, "未授权");
        }
        return new ModelAndView("error/403");
    }


    @ExceptionHandler({Exception.class})
    public Object handleException(Exception e, HttpServletRequest request) {
        LogDO logDO = new LogDO();
        logDO.setGmtCreate(new Date());
        logDO.setOperation(Constant.LOG_ERROR);
        logDO.setMethod(request.getRequestURL().toString());
        logDO.setParams(e.toString());
        UserDO current = ShiroUtils.getUser();
        if(null!=current){
            logDO.setUserId(current.getUserId());
            logDO.setUsername(current.getUsername());
        }
        logService.save(logDO);
        logger.error(e.getMessage(), e);
        if (HttpServletUtils.jsAjax(request)) {
            return R.error(500, "服务器错误，请联系管理员");
        }
        return new ModelAndView("error/500");
    }
}

@RestController
public class MainsiteErrorController implements ErrorController {
    private Logger logger = LoggerFactory.getLogger(getClass());
    private static final String ERROR_PATH = "/error";

    @Autowired
    ErrorAttributes errorAttributes;

    @RequestMapping(
            value = {ERROR_PATH},
            produces = {"text/html"}
    )
    public ModelAndView errorHtml(HttpServletRequest request, HttpServletResponse response) {
        int code = response.getStatus();
        if (404 == code) {
            return new ModelAndView("error/404");
        } else if (403 == code) {
            return new ModelAndView("error/403");
        } else if (401 == code) {
            return new ModelAndView("login");
        } else {
            return new ModelAndView("error/500");
        }

    }

    @RequestMapping(value = ERROR_PATH)
    public R handleError(HttpServletRequest request, HttpServletResponse response) {
        response.setStatus(200);
        int code = response.getStatus();
        if (404 == code) {
            return R.error(404, "未找到资源");
        } else if (403 == code) {
            return R.error(403, "没有访问权限");
        } else if (401 == code) {
            return R.error(403, "登录过期");
        } else {
            return R.error(500, "服务器错误");
        }
    }

    @Override
    public String getErrorPath() {
        // TODO Auto-generated method stub
        return ERROR_PATH;
    }
}

3.用在何处，如何用。

所有的controller方法如果抛出异常了都会被异常处理器拦截，但是controller上不用加任务方法，不用做处理。